Hybrid soliwave technique for mitigating sulfate-reducing bacteria in controlling biocorrosion: a case study on crude oil sample

Microbiologically influenced corrosion (MIC) is among the common corrosion types for buried and deep-water pipelines that result in costly repair and pipeline failure. Sulfate-reducing bacteria (SRB) are commonly known as the culprit of MIC. The aim of this work is to investigate the performance of combination of ultrasound (US) irradiation and ultraviolet (UV) radiation (known as Hybrid soliwave technique, HyST) at pilot scale to inactivate SRB. The influence of different reaction times with respect to US irradiation and UV radiation and synergistic effect toward SRB consortium was tested and discussed. In this research, the effect of HyST treatment toward SRB extermination and corrosion studies of carbon steel coupon upon SRB activity before and after the treatment were performed using weight loss method. The carbon steel coupons immersed in SRB sample were exposed to HyST treatment at different time of exposure. Additionally, Field Emission Scanning Electron Microscopy coupled with Energy Dispersive X-ray Spectroscopy were used to investigate the corrosion morphology in verifying the end product of SRB activity and corrosion formation after treatment. Results have shown that the US irradiation treatment gives a synergistic effect when combined with UV radiation in mitigating the SRB consortium.

微生物诱导腐蚀（Microbiologically influenced corrosion, MIC）是埋地与深水管道常见的腐蚀类型之一，可引发高额修复成本与管道失效事故。硫酸盐还原菌（Sulfate-reducing bacteria, SRB）是公认的微生物诱导腐蚀元凶。本研究旨在探究中试规模下超声（ultrasound, US）辐照与紫外（ultraviolet, UV）辐照联用技术（即混合声波技术，Hybrid soliwave technique, HyST）灭活硫酸盐还原菌的性能。实验考察了超声与紫外辐照的不同反应时长对硫酸盐还原菌菌群的影响，并探讨了二者的协同效应。本研究采用失重法，评估了HyST处理对硫酸盐还原菌的杀灭效果，并探究了处理前后硫酸盐还原菌活性对碳钢试片腐蚀行为的影响：将浸泡于硫酸盐还原菌培养液中的碳钢试片置于HyST体系中，设置不同辐照时长进行处理。此外，借助场发射扫描电子显微镜（Field Emission Scanning Electron Microscopy, FESEM）与能量色散X射线光谱仪（Energy Dispersive X-ray Spectroscopy, EDS）对腐蚀形貌进行表征，以验证处理后硫酸盐还原菌的代谢终产物与腐蚀生成产物。结果表明，超声辐照与紫外辐照联用时可产生协同效应，有效抑制硫酸盐还原菌菌群的增殖。